On Sep 12, 12:07 pm, Janis Papanagnou <Janis_Papanag...@hotmail.com>
wrote:
> littleh...@gmail.com wrote:
> > On Sep 11, 3:52 pm, Cyrus Kriticos <cyrus.kriti...@googlemail.com>
> > wrote:
>
> >>littleh...@gmail.com wrote:
>
> >>> I am trying to put together a script to compare the dates of a file
> >>>and send out an email notification if the date on the file is beyond
> >>>30 calendar days. However, I am having a bit of trouble. The file
> >>>format is <filename>_%m%d%y. So for example
> >>>foobar1_090207
> >>>foorbar2_090307
> >>>foorbar3_091507
>
> >> ^^
> >> future? typo?
>
> >>> I parse the file so I am just left with the date extension from
> >>>there I want to be notified of any file over the 30 day mark.
>
> >>>I tried using expr and setting up a variable for the 30 days but its
> >>>not working. Any would be appreciated. Thanks.
>
> >>[bash]
>
> >>$ FILENAME="foobar1_090207"
> >>$ TIME="${FILENAME#*_}"
>
> >>$ PAST="$(date -d "20${TIME:4:2}-${TIME:0:2}-${TIME:2:2}" +'%s')"
> >>$ NOW=$(date -d $(date +'%Y-%m-%d') +'%s')
>
> >>$ let DIFF=(NOW-PAST)/60/60/24
> >>$ echo "diff in days: $DIFF"
> >>diff in days: 9
>
> >>--
> >> Best regards | "The only way to really learn scripting is to write
> >> Cyrus | scripts." -- Advanced Bash-Scripting Guide
>
> > I changed the script around a bit to search for all the files and go
> > through them. Problem is is only reads and works on the one file so
> > the dates are returning as the same. Any ideas?
>
> > #!/bin/bash
> > FILENAME=`ls /<path_to_file>| grep _[0-9]` (this produces foo_090407
> > foo_090507 foo_090607)
> > for i in $FILENAME
> > do
> > TIME="${FILENAME#*_}"
>
> TIME="${i#*_}"
>
> Janis
>
> > PAST="$(date -d "20${TIME:4:2}-${TIME:0:2}-${TIME:2:2}" +'%s')"
> > NOW=$(date -d $(date +'%Y-%m-%d') +'%s')
> > let DIFF=(NOW-PAST)/60/60/24
> > echo "$i diff in days: $DIFF"
> > done
>
> > The above produces
> > foo_090407 diff in days: 8
> > foo_090507 diff in days: 8
> > foo_090607 diff in days: 8

That looks to be the solution. Thanks. Also, for my own reference
what does ${i#*_} expand to? Obviously $i. But what about the bit
after? Thanks.